public class Example2_2{
  public static void main (String args[]){
    byte b = 22 ;
    int n = 129 ;
    float f =123456.6789f;
    double d =123456789.123456789;
    System.out.println("b = " +b );
    System.out.println("n = " +n );
    System.out.println("f = " +f );
    System.out.println("d = " +d );
    b = (byte)n;//导致精度的损失
    f = (float)d;//导致精度的损失
    System.out.println("b = " +b );
    System.out.println("f = " +f);    
  }
}

